The mean tropical year in 2000 was 365.24219 ephemeris days; each ephemeris day lasting 86, 400 SI seconds.
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The mean tropical year in 2000 was 365.24219 ephemeris days; each ephemeris day lasting 86, 400 SI seconds.
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Where the time variable, here represented as E, now represents time in ephemeris centuries of 36525 ephemeris days of 86400 ephemeris seconds.
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In the Syst�me International ( SI ), the length of day during the late 19th century was used to define the second . ( See ?T . ) In recent decades, the length of a solar day has usually been a couple milliseconds more than an ephemeris day.
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Note that the above formulae give the length of the tropical year in ephemeris days ( equal to 86, 400 SI seconds ), not solar days . It is the number of solar days in a tropical year that is important for keeping the calendar in synch with the seasons ( see below ).
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